Grand Cayman Island: Barrel Sponge Spawning

We are scooting along through mind-bending incredible, clear Sapphire-blue water today, while ascending to about 120ft, I notice this smoke-like plume pouring up into the water column from the wall. At first I wonder if it’s some
sort of geothermic vent? So we head over to investigate — Not a vent at all, but a big barrel sponge releasing a discharge – turns out that we happened upon a rare spawning event of a male Barrel Sponge! What are the chances? Researching a bit, it sounds like it only happens for an hour, possibly bi-annually? What an incredibly cool miracle of nature to witness.